is 2 6937379 - 1
has 2088360 decimal digits
takes 1.513 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LCEEC786210D68D06double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272137.852368.0556%40000004143239108.33317.9732%146.185470.6026%
Target2674.283265.6716%4500072000000.13752.2372%4.420666.4396%
Difference+5+133.5691+2.3839%+3955000+407123910+8.1956+5.7360%+141.7648+4.1629%

Known prime factors:
No known factors for M6937379

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-10-27ANONYMOUSv4_computers2500087500---0.009--0.431%
2011-09-03Carsten Kossendeymother44000013310000---0.361--3.506%
2021-06-02Dylan DelgadoManual testing6300001890000012---0.514--3.948%
2021-11-19Seth_TrManual testing400000011000000012---3.091--6.532%
2021-12-02Seth_TrManual testing4000000414323910---8.333--7.973%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-05ANONYMOUSv4_computers21262--0.089--
1999-11-24ANONYMOUSv4_computers21263--0.230--
2014-02-09NesowaManual testing263264--0.283--
2014-02-16lycornManual testing264265--0.539--
2015-06-26VictordeHollanderManual testing265266--1.077--
2016-04-05Gordon SpenceManual testing266267--2.154--
2018-02-27-Anonymous-Manual testing267268--4.309--
2020-04-24TJAOIManual testing268269--8.617--
2021-07-25takahashiManual testing269270--17.23--
2021-08-11SRBaseManual testing270271--34.47--
2021-09-25SRBaseManual testing271272--68.94--


ECM factoring results:
Total ECM effort:1.989 GHz-days
Estimated T-Level:1.154
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.989


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-05-05ANONYMOUSv4_computersCEEC786210D68D061.513
2001-12-01ANONYMOUSv4_computersCEEC786210D68D061.513


PRP results:
No PRP results for M6937379


P-1 factor-bounds graph:
B1 = 4000000, B2 = 414323910 (P-1 stage 2)
B1 = 4000000, B2 = 110000000 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 630000, B2 = 18900000 (P-1 stage 2)
B1 = 440000, B2 = 13310000 (P-1 stage 2)
B1 = 630000 (P-1 stage 1)
B1 = 440000 (P-1 stage 1)
B1 = 25000, B2 = 87500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
TF factor-bounds graph:
272
271
270
269
268
267
266
265
264
263
262
this exponent TF target: 67
TF double-checked to: 67.8
ECM T-Level=1.15 ~= -13-bit
250
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270
280
Last modified: 2023-06-05T21:50:05+00:00